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Cannot access it anymore

Hi,
I"m running the server version 1.7.5.4035 on FreeNAS. The server has security disabled. When I try to access the web interface via dns name, like plex:32400/web/index.html, I'm presented with no server and the Plex Pass advertising, even when I'm logged in.
And the "Looking for servers..." is displayed on the upper-left side.

When I access the interface via IP, everything is fine, I can see the interface, settings and all.
One strange thing is that I get a message "An unclaimed media server has been found on your network. Claim it now".
The dns mapping is correct.

Mmm, nope.
I set the in Network/List of IP addresses and networks that are allowed without auth to the IP/net mask for my network. No use.
Anyway, I was talking about accessing via name instead of ip. If this "security" you are talking about would be enforced, I wouldn't be able to access the server at all.
And why is it making GET requests to http://127.0.0.1:32400/?X-Plex-Product=Plex? The Plex server is not installed on the same computer as the browser.
And the request to http://plex:32400/?X-Plex-Product=Plex is getting a 401 (Unauthorized).

Second, you need to provide specific information on your network setup. For example, you mention a DNS name and IP but you fail to mention what any of the IPs are nor how you are mapping an obviously non-public name to IP.

Right, sorry. I thought it's pretty obvious.
The server is installed on the FreeNAS - just one instance/version.
I'm trying to use the bwoser to connect to that server, to manage it.
By using the private IP on my internal network, I can access the server via browser.
When using the http://plex.home dns name associated with that private IP, I get the aforementioned error.
When I ping the plex.home, I get a reply from the IP, so the nework is working fine.

@bdaniel7 said:
Right, sorry. I thought it's pretty obvious.
The server is installed on the FreeNAS - just one instance/version.
I'm trying to use the bwoser to connect to that server, to manage it.
By using the private IP on my internal network, I can access the server via browser.
When using the http://plex.home dns name associated with that private IP, I get the aforementioned error.
When I ping the plex.home, I get a reply from the IP, so the nework is working fine.

What irks me is that, before version 1.7.5.4035, it used to work.

And how can I download the logs when I can't connect to the server?

I can see attempts to access via domain name plex and getting rejected as unauthorized

Howdy, Stranger!

When logs (server or client app) are requested for an investigation, please do NOT turn on "verbose" logging unless it is explicitly requested. Verbose logging makes things much more difficult in the majority of cases.